Air-compressor control



P. H. GENTZEL. MR COMPRESSOR CONTROL. APPLlCATlON- FILED DEC.6, 1919.

Patented Mar. 28, 1922.

re STAT as W metr cs.

PERBYH; ennrznt, or NEWTON, MASSACHUSETTS.

AIR COMPRESSOR CONTROL.

To alt 207mm it may concern:

Be it known that I, Pnnnv H. G'ex'rznr, a citizen of the UnitedStates; residing at Newtomin the countvof llliddlesex and State of Massachusetts,have invented certain new and useful Improvements in Airtlompressm' Controls of which the following is a specification.

My said inventionconsists in certain improvements in'means for the relief of pressure in the compressed air tank, suchas forms a part ol, a steam operated motor car, when said pressure has reached a -pre- In said drawings, the portions marked A represent the piston rod, B the pump cylinder and C a relief valve casing.

The piston rod A is a continuation of the piston rod of the engine, and has a piston 10 thereon which operates in pump cylinder B continuously while the engine is in operation. At each end of said cylinder B on one side are mounted air intake valves 11 and 12 respectively, and on the other side are mounted discharge valves 13 and 14 respectively, which are connected with a pipe 15 leadin to the compressed air cylinder or tank Fnot shown). f

At each stroke of the piston 10 inone direction, the air will be sucked in through valve 11 and the air on the other side of the piston forced out through valve 14: into pipe 15 and into the compressed air cylinder. On the return stroke the air will be sucked in through the pipe 12 while the air sucked in during the previous stroke through valve 11 will be forced out through valve 18 into pipe 15 and to the compressed air cylinder.

Mounted on the top of cylinder B is a frame 16 supporting the relief valve casing or cylinder In said frame is mounted a reciprocating head 17 carrying transversely Specification of Letters Patent.

Patented Mar. 28, 1922.

- Applicationfiled December 6, 1919; Serial No. 342,942.

extending arms 18 which are adapted to contact upon occasion with the upper ends of the valve stems 19 and 20 of the valves 11 and 12., Slides connected with the reciprocating structure and mounted by slots therein on pins31 on frameilli serve to steady and guide the same. The head 17 is also connected by a ring or hearing sleeve 32 with a cam 33 on a shaft 34 provided with an operating arm 35 by which said'head with arms 18 maybenormally raised and lowcred when desired, as will be presently described. Said; sleeve 32"has a screw-threaded shank which extends through a perforation in. yokelTand hasanut 37 on itsupper end. for adjustment; as will stood. A .pipe 21 leads from the upper end 01? casing C. to1the compressed air: cylinder. A sleeve 22 is mounted to reciprocate in said be readily undercasing C and is formed with a closed upper end against which the upper end of a rod 23 rests, said rod 23 being connected with the head 17 carrying the cross arms 18. Said rod 23 is normally held upward by means of a spring 24 interposed between a flange on its upper end and a screw plug seated in the lower end of said casing. Said plug is screw threaded mounted in said casing by its adjustment thereby connections, and serves to tUlJUStthe tension of said spring.

In operation, when it is desired to start the engine arm 35 is operated to open valves 1.1 and 12 and relieve the suction. After the engine is in operation the arms 18 are raised to permit said valves to close and the operation of pumping air to the compressed air cylinder proceeds. VVhen' the air in the compressed air cylinder reaches a pre-determined, pressure which pressure is determined by the tension of said spring 24, then the pressure above the upper end of the piston 22 will overcome the pressure of said spring and force the head 17 carrying the arms18 downwardly so that said arms will contact with the upper ends of valve stems 19 and 20 and open valves 11 and 12, thus permitting the air to exhaust and the pump to run without suction and without forcing any more air into the compressed air cylinder. until the pressure therein has fallen to a'point where the tension of spring 24 will overbalance.

said pressure and raise said arms 18 and close valves 11 and 12,- or bring them to normal active position. I

By this means the pump is allowed to run constantly and the pressure is controlled an 1 of its piston to pump air position, a piston rod tomatically and maintained at the pressure keep the cylinder cool.

Having thus fully described my said invention, what I claim as new and desire to seeure'by Letters Patent is:

1. In an air-compressing mechanism, an air pump adapted to operate on both strokes into the compressed air cylinder, a casing mounted upon the pump adapted to house a reciprocating piston, a pipe leading from the air-cylinder and in operable communication with the piston, a spring for maintaining the piston in normal ton provided with arms extending outwardly from both sides of the piston rod, spring.-

seated valves at both extremities of the pump for admitting airthereto, said valves being separable from but contacting with the extending arms and adapted to be held in unseated position by the arms-when forced downward by the piston, a ring bearing adjustably secured to the piston rod, and a cam within the ring bearing adapted to be rotated by a hand lever "for raising and lowering the piston rod and said extending arms.

desired, and the air circulation operates tov operable with the pis 2. In an air compressing mechanism, an aupump comprising a piston adapted to operate on both strokes of said plston rod to pumpairiinto the compressed air cylinder,

spring seated valves positioned at both ends of the pump, pump, a reciprocating piston within the easing, a piston rod operable with the piston having outwardly extending arms adapted to contact and depress the said valves, a spring for normally holding said arms out of contact with said valves, and means for manually raising or lowering the reciprocating parts to simultaneously throw thearms' out of engagement with the valves or depress them.

In witness whereof, I have hereunto set my hand and seal at Boston, lllassachusetts this twenty-first day of November, D. nineteen hundredand nineteen.

PERRY i-I. ennrznn a 8.

\Vitnesses E. XV. BRADFORD, E, K. REIGHENBAGH.

a casing mounted upon the p 

